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I've received emails from users who are interested in developing new planets and would like some tips. In the spirit of the old wa, I'll post a few from my new project...
I'm using altitude-offsets to create a 3D fractal structure that exists in the domain of Altitude, not World Space. The underlying geometric terrain contributes to that structure, since it provides the 'ground level' that altitude is calculated from.
Terrain geometry intersects various regions of the offset-altitude domain according to blends that are based on the displacements. For further info, search the Mojo forum archive for 'altitude offsets'.
This altitude distortion only exists mathematically but the intersections with terrain can be shown by driving the diffuse material blends with the same FG tree (above).
I've added a small refinement to the node-tree diagram that calyxa used to illustrate the inner workings of the 'Altitude and Slope' leaf-node on page 231 of the MojoWorld User Guide - you all have User Guides, right?
I've inserted a Curve node under the Slope node to help shape the Slope output.
It's all tied in to the alt-offset blend by an Add node that also holds the primary offset value in 'Add 1'.